Duchenne Smile: engages your eye and mouth muscles
A Buddhist Teaching:
Laughter Therapy: practice of laughing
Studies:
http://www.ncbi.nlm.nih.gov/pubmed/23012270
http://www.ncbi.nlm.nih.gov/pubmed/12899366
http://www.ncbi.nlm.nih.gov/pubmed/22481535
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